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820-2914 No Backlight

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  • 820-2914 No Backlight

    Liquid damaged 820-2914 board where three pins on the LVDS connector were blown and the LVDS cable was also burned. The LVDS connector was replaced and now the screen gets picture but no backlight. Traced it back to the backlight driver, replaced the chip with a L8545SQ chip and the board gets and green light and fans spin but no post. With the old chip originally and after re-soldering the old chip back on to make sure the board wasn't further damaged the fans spin up, stop, then spin up again and after a few seconds chimes and posts. Is this considered "quarter fan spin" or most likely a short that is now happening after the power has been restored to the LCD Backlight traces with the new chip?

  • #2
    It is normal for on/off/on and then chime.
    If the connector and cable were burned F9800 is probably dead too. I assume you also replaced the LCD cable!

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    • #3
      Yes I should've mentioned that as well F9800 was blown after replacing viola we have backlight, the hunt is now to check the data lines as the flashing folder is white almost like there is no pigment in the screen! "Curiouser and Curiouser" -Alice

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      • #4
        Bad soldering on the connector or damaged connector

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